SWOMCD
SPC MCD 220633
OHZ000-KYZ000-INZ000-221230-
MESOSCALE DISCUSSION 0288
NWS STORM PREDICTION CENTER NORMAN OK
1233 AM CST FRI FEB 22 2008
AREAS AFFECTED...SERN IND...NRN KY...SWRN OH
CONCERNING...WINTER MIXED PRECIPITATION
VALID 220633Z - 221230Z
A MIX OF FREEZING RAIN/SLEET WILL DEVELOP NEWD THROUGH THE REGION
BETWEEN 08-13Z. HRLY ACCUMULATION RATES UP TO 0.20 INCH WILL BE
POSSIBLE WITH THE STRONGEST CONVECTIVE SHOWERS...BUT AVERAGE RATES
WILL BE LESS THAN 0.10 INCH.
LATEST SFC ANALYSIS SHOWS THE FREEZING LINE EXTENDING FROM NEAR LEX
KY SWWD TO NEAR PAH. A SHORTWAVE TROUGH OVER SRN MO/WRN AR AND
MODERATE WAA ASSOCIATED WITH THIS SYSTEM WILL CONTINUE TO SUPPORT
NEWD MOVEMENT OF A LARGE AREA OF PRECIPITATION FROM THE MID MS
VALLEY NEWD THROUGH THE OHIO VALLEY. WET-BULB COOLING AFFECTS WILL
SUPPORT A NEARLY STATIONARY OR SLOW SWD MOVEMENT OF THE FREEZING
LINE THROUGH THE OHIO VALLEY. GIVEN THE CONVECTIVE NATURE OF THE
PRECIPITATION...SLEET MAY BE DOMINANT P-TYPE MODE...ALTHOUGH THE
DEPTH OF THE ELEVATED ABOVE FREEZING LAYER /2-3 KM/ SUGGESTS
FREEZING RAIN WILL ALSO BE LIKELY...ESPECIALLY ALONG AND SOUTH OF
THE OHIO RIVER. THE PROGRESSIVE NATURE OF THIS SYSTEM SUGGESTS THAT
ANY ONE LOCATION WILL ONLY RECEIVE 1-2 HRS OF MODERATE PRECIPITATION
RATES.
.CROSBIE.. 02/22/2008
..PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
..NOTICE...
SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.
ATTN...WFO...RLX...JKL...ILN...LMK...IND...PAH...
38728651 38428697 37688708 37518655 37748481 37988354
38388317 39008325 39288460
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